CN203674989U - Frequency converter - Google Patents
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- CN203674989U CN203674989U CN201320859247.XU CN201320859247U CN203674989U CN 203674989 U CN203674989 U CN 203674989U CN 201320859247 U CN201320859247 U CN 201320859247U CN 203674989 U CN203674989 U CN 203674989U
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- 238000004804 winding Methods 0.000 claims abstract description 40
- 239000003990 capacitor Substances 0.000 claims description 25
- 230000005611 electricity Effects 0.000 abstract 2
- 238000011217 control strategy Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
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Abstract
The utility model provides a frequency converter, including rectifier circuit, power factor correction circuit and inverter circuit, rectifier circuit power factor correction circuit with inverter circuit connects gradually, rectifier circuit's one end is connected with the alternating current power supply electricity, inverter circuit is connected with the load electricity. The power factor correction circuit comprises a first inductor L2 and a first transistor Z1; the first inductor comprises a first winding N1 and a second winding N2, the first winding N1 is connected with the second winding N2 in series; the homonymous terminal of the second winding N2 is electrically connected with the collector of a first transistor Z1, a tap of the first inductor L2 is coupled to an inverter circuit, and the heteronymous terminal of the first winding N1 is coupled to the rectifier circuit; the emitter of the first transistor Z1 is coupled to ground, and one end of the rectifying circuit is coupled to ground. The utility model discloses a converter has reduced the voltage of direct current generating line to the loss of transistor has been reduced, makes this converter save the electric energy.
Description
Technical field
The utility model relates to converter technology field, particularly relates to a kind of energy-conservation frequency converter.
Background technology
As Fig. 1 frequency converter that is prior art, the work characteristics of himself has determined that transistor Z2～Z7 wherein exists frequent switch motion in the situation that of high-voltage great-current, this will cause transistor to produce larger on-state loss and switching loss, thereby has reduced the inversion efficiency of inverter circuit.Wherein, the power output that the inversion efficiency of inverter circuit is inverter circuit and the ratio of input power.Meanwhile, transistor Z2～Z7 is frequent switch motion in the situation that of high-voltage great-current, has caused transistorized working temperature higher, and transistorized reliability is reduced; For this reason, need specialized designs heat abstractor, cost is higher.
Utility model content
In view of the present situation of prior art, the purpose of this utility model is to provide a kind of frequency converter, the DC bus-bar voltage of inverter circuit is reduced, thereby realize transistorized loud-break switch in inverter circuit and, to the transformation of low-voltage, high-current switch, reduce transistorized on-state loss and switching loss in inverter circuit.
For achieving the above object, the utility model adopts following technical scheme:
A kind of frequency converter, comprise rectification circuit, power factor correction circuit and inverter circuit, described rectification circuit, described power factor correction circuit and described inverter circuit are connected successively, and one end of described rectification circuit is electrically connected with AC power, and described inverter circuit is electrically connected with load;
Described power factor correction circuit comprises the first inductance L 2 and the first transistor Z1;
Described the first inductance comprises the first winding N1 and the second winding N2, and described the first winding N1 connects with described the second winding N2;
The Same Name of Ends of described the second winding N2 is electrically connected with the collector electrode of the first transistor Z1, and the tap of described the first inductance L 2 is coupled to inverter circuit, and the different name end of described the first winding N1 is coupled to described rectification circuit;
The emitter-coupled of described the first transistor Z1 is to ground, and one end of described rectification circuit is coupled to ground.
In an embodiment, described power factor correction circuit also comprises the second inductance L 1, the first diode D1, the second diode D2 and capacitor C 1 therein;
One end of described the second inductance L 1 is coupled to described rectification circuit, and the other end of described the second inductance L 1 connects the anode of described the first diode D1 and described the second diode D2;
The negative electrode of described the first diode D1 is electrically connected with the Same Name of Ends of described the second winding N2, and the negative electrode of described the second diode is electrically connected with the different name end of described the first winding;
One end of described capacitor C 1 connects the negative electrode of the second diode D2 and the different name end of described the first winding N1, and the other end of described electric capacity is coupled to ground.
In an embodiment, described capacitor C 1 is electrochemical capacitor therein;
The positive pole of described capacitor C 1 connects the negative electrode of the second diode D2 and the different name end of described the first winding N1, and the negative pole of described capacitor C 1 is coupled to ground.
In an embodiment, described inverter circuit comprises six transistors therein, is respectively transistor seconds Z2, the 3rd transistor Z3, the 4th transistor Z4, the 5th transistor Z5, the 6th transistor Z6 and the 7th transistor Z7;
The collector electrode of described transistor seconds Z2, described the 3rd transistor Z3 and described the 4th transistor Z4 is all connected to the tap of described the first inductance L 2;
The emitter of described transistor seconds Z2 is electrically connected with the collector electrode of described the 5th transistor Z5, the emitter of described the 3rd transistor Z3 is electrically connected with the collector electrode of described the 6th transistor Z6, and the emitter of described the 4th transistor Z4 is electrically connected with the collector electrode of described the 7th transistor Z7;
The emitter-coupled of described the 5th transistor Z5, described the 6th transistor Z6 and described the 7th transistor Z7 is to ground.
In an embodiment, described the first transistor Z1 extremely described the 7th transistor Z7 is npn type bipolar transistor therein.
In an embodiment, described load is motor therein, and the three-phase of described motor is connected to respectively the emitter of described transistor seconds Z2, the emitter of the emitter of described the 3rd transistor Z3 and described the 4th transistor Z4.
In an embodiment, described rectification circuit is rectifier bridge therein.
The beneficial effects of the utility model are:
Frequency converter of the present utility model, the upper brachium pontis of the DC bus of inverter circuit is from the middle power taking of the first inductance, before transistorized switch motion in inverter circuit, first control the first transistor conducting, thereby reduce the voltage of DC bus, realize transistorized high-voltage large current switch in inverter circuit and changed to low-voltage, high-current switch, thereby reduced transistorized on-state loss and switching loss, made this frequency converter save electric energy.Meanwhile, this frequency converter has been realized the function of Active PFC and the function that DC bus-bar voltage regulates.
Brief description of the drawings
Fig. 1 is the circuit theory diagrams of the frequency converter of prior art;
Fig. 2 is the circuit theory diagrams of an embodiment of frequency converter of the present utility model.
Embodiment
In order to make the technical solution of the utility model clearer, below in conjunction with accompanying drawing, frequency converter of the present utility model is described in further detail.Should be appreciated that specific embodiment described herein is only in order to explain the utility model and to be not used in restriction the utility model.
The circuit theory diagrams that are illustrated in figure 2 an embodiment of frequency converter of the present utility model, this frequency converter comprises rectification circuit, power factor correction circuit and inverter circuit.Wherein, one end of rectification circuit is electrically connected with AC power, and rectification circuit is electrically connected successively with power factor correction circuit and inverter circuit, and inverter circuit is electrically connected with load.Preferably, this rectification circuit is rectifier bridge, and this rectifier bridge DB1 is made up of four diodes, for AC power is converted into DC power supply.
Power factor correction circuit comprises the first inductance L 2 and the first transistor Z1.The first inductance L 2 comprises the first winding N1 and the second winding N2, and the first winding N1 connects with the second winding N2.It should be understood that series connection herein refers to that the Same Name of Ends of the first winding N1 connects with the different name end of the second winding N2.
The Same Name of Ends of the second winding N2 is electrically connected with the collector electrode of the first transistor Z1, and the tap of the first inductance L 2 is coupled to inverter circuit, and the different name end of the first winding N1 is coupled to rectification circuit.The emitter-coupled of the first transistor Z1 is to ground.Preferably, the first transistor Z1 is npn type bipolar transistor.
Preferably, inverter circuit is three-phase inverting circuit.The collector electrode of transistor seconds Z2, the 3rd transistor Z3 and the 4th transistor Z4 is all connected to the tap of the first inductance L 2, and the collector electrode of transistor seconds Z2, the 3rd transistor Z3 and the 4th transistor Z4 is all connected to the Same Name of Ends of the first winding N1.The emitter-coupled of the 5th transistor Z5, the 6th transistor Z6 and the 7th transistor Z7 is to ground.
The emitter of transistor seconds Z2 is electrically connected with the collector electrode of the 5th transistor Z5, and the base stage of transistor seconds Z2 connects the upper brachium pontis pwm control signal UP of U phase, and the base stage of the 5th transistor Z5 connects the lower brachium pontis pwm control signal UN of U phase.The emitter of the 3rd transistor Z3 is electrically connected with the collector electrode of the 6th transistor Z6, and the base stage of the 3rd transistor Z3 connects the upper brachium pontis pwm control signal VP of V phase, and the base stage of the 6th transistor Z6 connects the lower brachium pontis pwm control signal VN of V phase.In like manner, the emitter of the 4th transistor Z4 is electrically connected with the collector electrode of the 7th transistor Z7, and the base stage of the 4th transistor Z4 connects the upper brachium pontis pwm control signal WP of W phase, and the base stage of the 7th transistor Z7 connects the lower brachium pontis pwm control signal WN of W phase.
Preferably, transistor seconds Z2 to the seven transistor Z7 are npn type bipolar transistor.In the present embodiment, load is motor.And the U of motor is connected to the emitter of transistor seconds Z2, the V of motor is connected to the emitter of the 3rd transistor Z3, and the W of motor is connected to the emitter of the 4th transistor Z4.
In inverter circuit before transistorized switch motion, first control the first transistor conducting, the upper brachium pontis P utmost point of the DC bus of inverter circuit is from the middle power taking of the first inductance, reduce the voltage of the upper brachium pontis P utmost point of DC bus, realize in inverter circuit transistorized high-voltage large current switch to the transformation of low-voltage, high-current switch, reduce transistorized on-state loss and switching loss in inverter circuit, made the loss of this frequency converter reduce by 30%, realized the power saving function of frequency converter.
After the conducting of the first transistor Z1, then control the switch motion of the transistor Z2～Z7 in inverter circuit, thereby the upper brachium pontis P electrode drop of DC bus is low to moderate to lower magnitude of voltage.In the present embodiment, the magnitude of voltage of the upper brachium pontis P utmost point of DC bus is according to N2/(N1+N2) value determine, and then require to control the switch state of transistor Z2～Z7 according to the control of motor.In the present embodiment, the magnitude of voltage at the two ends of the second winding N2 is the magnitude of voltage of the upper brachium pontis P utmost point of DC bus, therefore, can require according to the control of motor the position of the tap that regulates tap inductor L2, and then realize the adjusting of the magnitude of voltage of the upper brachium pontis P utmost point of DC bus.
As a kind of embodiment, power factor correction circuit also comprises the second inductance L 1, the first diode D1, the second diode D2 and capacitor C 1.Wherein, one end of the second inductance L 1 is coupled to rectification circuit DB1, and the other end of the second inductance L 1 connects the anode of the first diode D1 and the second diode D2.The negative electrode of the first diode D1 is electrically connected with the Same Name of Ends of the second winding N2, and the negative electrode of the second diode D2 is electrically connected with the different name end of the first winding N1.One end of capacitor C 1 connects the negative electrode of the second diode D2 and the different name end of the first winding N1, and the other end of electric capacity is coupled to ground.
Wherein, the first diode D1 is for preventing that current reflux in the first inductance L 2 is to AC power, and the second diode D2 is for preventing that current reflux in capacitor C 1 is to AC power.Preferably, capacitor C 1 is electrochemical capacitor.And the positive pole of capacitor C 1 connects the negative electrode of the second diode D2 and the different name end of the first winding N1, and the negative pole of capacitor C 1 is coupled to ground.
In the time of the first transistor Z1 conducting, the loop that AC power forms by the first diode D1, the first transistor Z1 after rectification circuit DB1 rectification charges to the second inductance L 1, the second inductance L 1 store electrical energy.Now carry out the exchange of energy by the charging and discharging of controlling between the second inductance L 1 and capacitor C 1, maintain the electromagnetic induction process of inductive load.Due in sinusoidal ac circuit, 90 °, the voltage delay electric current of capacitor, 90 ° of the voltage leading currents of inductance, therefore as long as the capacitive reactance of electric capacity and the collocation of the induction reactance of inductance are suitable, just can reach in electrical network the phase place of voltage and current identical, and AC power is unaffected, realize the function of Active PFC.
It should be understood that power factor (PF) herein refers to the active power in loop and the ratio of gross power of system, power factor (PF) can be weighed the degree that electric power is used effectively.The value of power factor (PF) is larger, and the utilance of electric power is higher, but is the highlyest no more than 1.Active PFC is exactly that the electric current (inductance current) of forbidding inductive load is back to electrical network, will keep all the time the phase place of the voltage and current in electrical network identical.
In the time that the first transistor Z1 ends, AC power, by after rectification circuit DB1 rectification, is charged to capacitor C 1 by the second inductance L 1, the second diode D2, capacitor C 1 store electrical energy.Now, the energy storing in the second inductance L 1 charges by the second diode D2 capacitor C 1, and capacitor C 1 is the upper brachium pontis P utmost point power supply to DC bus by the first inductance L 2, can realize the function that DC bus-bar voltage promotes.In the time that direct voltage is lower, not needing increases extra DC/DC boost inverter, has reduced the cost of transformer, has simplified circuit structure like this.
In the time of the load variations of inverter circuit, while changing as the number of turn of the coil of motor, can take specific control strategy, this control strategy can be that to maintain Dead Time constant or change inverter circuit or change the mode etc. of the switching frequency of the first transistor Z1.Keep power factor correction circuit to export constant voltage by above-mentioned specific control strategy, meet the requirement of Electric Machine Control.
Above-mentioned frequency converter, the upper brachium pontis of the DC bus of inverter circuit is from the middle power taking of the first inductance, before transistorized switch motion in inverter circuit, first control the first transistor conducting, thereby reduce the voltage of DC bus, realize transistorized high-voltage large current switch in inverter circuit and changed to low-voltage, high-current switch, thereby reduced transistorized on-state loss and switching loss, made this frequency converter save electric energy.Meanwhile, this frequency converter has been realized the function of Active PFC and the function that DC bus-bar voltage regulates.
The above embodiment has only expressed several execution mode of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.
Claims (7)
1. a frequency converter, comprise rectification circuit, power factor correction circuit and inverter circuit, described rectification circuit, described power factor correction circuit and described inverter circuit are connected successively, one end of described rectification circuit is electrically connected with AC power, described inverter circuit is electrically connected with load, it is characterized in that:
Described power factor correction circuit comprises the first inductance L 2 and the first transistor Z1;
Described the first inductance comprises the first winding N1 and the second winding N2, and described the first winding N1 connects with described the second winding N2;
The Same Name of Ends of described the second winding N2 is electrically connected with the collector electrode of the first transistor Z1, and the tap of described the first inductance L 2 is coupled to inverter circuit, and the different name end of described the first winding N1 is coupled to described rectification circuit;
The emitter-coupled of described the first transistor Z1 is to ground, and one end of described rectification circuit is coupled to ground.
2. frequency converter according to claim 1, is characterized in that:
Described power factor correction circuit also comprises the second inductance L 1, the first diode D1, the second diode D2 and capacitor C 1;
One end of described the second inductance L 1 is coupled to described rectification circuit, and the other end of described the second inductance L 1 connects the anode of described the first diode D1 and described the second diode D2;
The negative electrode of described the first diode D1 is electrically connected with the Same Name of Ends of described the second winding N2, and the negative electrode of described the second diode D2 is electrically connected with the different name end of described the first winding N1;
One end of described capacitor C 1 connects the negative electrode of described the second diode D2 and the different name end of described the first winding N1, and the other end of described electric capacity is coupled to ground.
3. frequency converter according to claim 2, is characterized in that:
Described capacitor C 1 is electrochemical capacitor;
The positive pole of described capacitor C 1 connects the negative electrode of described the second diode D2 and the different name end of described the first winding N1, and the negative pole of described capacitor C 1 is coupled to ground.
4. according to the frequency converter described in claim 1-3 any one, it is characterized in that:
Described inverter circuit comprises six transistors, is respectively transistor seconds Z2, the 3rd transistor Z3, the 4th transistor Z4, the 5th transistor Z5, the 6th transistor Z6 and the 7th transistor Z7;
The collector electrode of described transistor seconds Z2, described the 3rd transistor Z3 and described the 4th transistor Z4 is all connected to the tap of described the first inductance L 2;
The emitter of described transistor seconds Z2 is electrically connected with the collector electrode of described the 5th transistor Z5, the emitter of described the 3rd transistor Z3 is electrically connected with the collector electrode of described the 6th transistor Z6, and the emitter of described the 4th transistor Z4 is electrically connected with the collector electrode of described the 7th transistor Z7;
The emitter-coupled of described the 5th transistor Z5, described the 6th transistor Z6 and described the 7th transistor Z7 is to ground.
5. frequency converter according to claim 4, is characterized in that:
Described the first transistor Z1 extremely described the 7th transistor Z7 is npn type bipolar transistor.
6. frequency converter according to claim 5, is characterized in that:
Described load is motor, and the three-phase of described motor is connected to respectively the emitter of described transistor seconds Z2, the emitter of the emitter of described the 3rd transistor Z3 and described the 4th transistor Z4.
7. frequency converter according to claim 6, is characterized in that:
Described rectification circuit is rectifier bridge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320859247.XU CN203674989U (en) | 2013-12-24 | 2013-12-24 | Frequency converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320859247.XU CN203674989U (en) | 2013-12-24 | 2013-12-24 | Frequency converter |
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| CN203674989U true CN203674989U (en) | 2014-06-25 |
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| CN201320859247.XU Expired - Fee Related CN203674989U (en) | 2013-12-24 | 2013-12-24 | Frequency converter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104734531A (en) * | 2013-12-24 | 2015-06-24 | 珠海格力电器股份有限公司 | Frequency converter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104734531A (en) * | 2013-12-24 | 2015-06-24 | 珠海格力电器股份有限公司 | Frequency converter |
| CN104734531B (en) * | 2013-12-24 | 2017-06-23 | 珠海格力电器股份有限公司 | Frequency converter |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140625 |