CN104734531B - Frequency converter - Google Patents
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- CN104734531B CN104734531B CN201310728104.XA CN201310728104A CN104734531B CN 104734531 B CN104734531 B CN 104734531B CN 201310728104 A CN201310728104 A CN 201310728104A CN 104734531 B CN104734531 B CN 104734531B
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Abstract
The invention provides a kind of frequency converter, including rectification circuit, power factor correction circuit and inverter circuit, the rectification circuit, the power factor correction circuit and the inverter circuit are sequentially connected, one end of the rectification circuit is electrically connected with AC power, and the inverter circuit is electrically connected with load.The power factor correction circuit includes the first inductance L2 and the first transistor Z1；First inductance is connected including the first winding N1 and the second winding N2, the first winding N1 with the second winding N2；The Same Name of Ends of the second winding N2 is electrically connected with the colelctor electrode of the first transistor Z1, and to inverter circuit, the different name end of the first winding N1 is coupled to the rectification circuit to the tap coupler of the first inductance L2；, coupled to ground, one end of the rectification circuit is coupled to ground for the emitter stage of the first transistor Z1.Frequency converter of the invention, reduces the voltage of dc bus, so as to reduce the loss of transistor so that the frequency converter saves electric energy.
Description
Technical field
The present invention relates to converter technology field, more particularly to a kind of frequency converter of energy-conservation.
Background technology
If Fig. 1 is the frequency converter of prior art, the work characteristics of its own determines transistor Z2~Z7 therein in height
Exist in the case of pressure high current and frequently switch on action, this will cause transistor to produce larger on-state loss and switching loss,
So as to reduce the inversion efficiency of inverter circuit.Wherein, the inversion efficiency of inverter circuit for inverter circuit power output with it is defeated
Enter the ratio of power.Meanwhile, transistor Z2~Z7 frequently switches on action in the case of high-voltage great-current, result in transistor
Operating temperature is higher so that the reliability reduction of transistor；For this reason, it may be necessary to heat abstractor is specially designed, it is relatively costly.
The content of the invention
In view of the present situation of prior art, it is an object of the invention to provide a kind of frequency converter so that the direct current of inverter circuit
Busbar voltage reduction, so as to the transformation that the loud-break switch for realizing transistor in inverter circuit is switched to low-voltage, high-current,
Reduce the on-state loss and switching loss of transistor in inverter circuit.
To achieve the above object, the present invention is adopted the following technical scheme that：
A kind of frequency converter, including rectification circuit, power factor correction circuit and inverter circuit, it is the rectification circuit, described
Power factor correction circuit and the inverter circuit are sequentially connected, and one end of the rectification circuit electrically connects with AC power, institute
Inverter circuit is stated to be electrically connected with load；
The power factor correction circuit includes the first inductance L2 and the first transistor Z1；
First inductance includes the first winding N1 and the second winding N2, the first winding N1 and the second winding N2
Series connection；
The Same Name of Ends of the second winding N2 is electrically connected with the colelctor electrode of the first transistor Z1, and the first inductance L2's takes out
Head is coupled to inverter circuit, and the different name end of the first winding N1 is coupled to the rectification circuit；
, coupled to ground, one end of the rectification circuit is coupled to ground for the emitter stage of the first transistor Z1.
Wherein in one embodiment, the power factor correction circuit also include the second inductance L1, the first diode D1,
Second diode D2 and electric capacity C1；
One end of the second inductance L1 is coupled to the rectification circuit, and the other end connection of the second inductance L1 is described
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, second diode
Negative electrode is electrically connected with the different name end of first winding；
One end of the electric capacity C1 connects the negative electrode of the second diode D2 and the different name end of the first winding N1, the electricity
The other end of appearance is coupled to ground.
Wherein in one embodiment, the electric capacity C1 is electrochemical capacitor；
The positive pole of the electric capacity C1 connects the negative electrode of the second diode D2 and the different name end of the first winding N1, the electricity
Hold the negative couplings of C1 extremely.
Wherein in one embodiment, the inverter circuit includes six transistors, 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 colelctor electrode of the transistor seconds Z2, the third transistor Z3 and the 4th transistor Z4 is connected to institute
State the tap of the first inductance L2；
The emitter stage of the transistor seconds Z2 is electrically connected with the colelctor electrode of the 5th transistor Z5, the 3rd crystal
The emitter stage of pipe Z3 is electrically connected with the colelctor electrode of the 6th transistor Z6, the emitter stage of the 4th transistor Z4 and described
The colelctor electrode electrical connection of seven transistor Z7；
The 5th transistor Z5, the emitter stage of the 6th transistor Z6 and the 7th transistor Z7 are coupled to ground.
Wherein in one embodiment, it is brilliant that the first transistor Z1 to the 7th transistor Z7 is bipolar npn
Body pipe.
Wherein in one embodiment, the load is motor, and the three-phase of the motor is respectively connecting to second crystalline substance
The emitter stage of the emitter stage of body pipe Z2, the emitter stage of the third transistor Z3 and the 4th transistor Z4.
Wherein in one embodiment, the rectification circuit is rectifier bridge.
The beneficial effects of the invention are as follows：
Frequency converter of the invention, the upper bridge arm of the dc bus of inverter circuit from the middle power taking of the first inductance, in inversion
Before the switch motion of the transistor in circuit, the first transistor conducting is first controlled, it is real so as to reduce the voltage of dc bus
The high-voltage large current for having showed transistor in inverter circuit is switched to low-voltage, high-current switch transformation, so as to reduce transistor
On-state loss and switching loss so that the frequency converter saves electric energy.Meanwhile, the frequency converter realizes the work(of Active PFC
Can be with the function of DC bus-bar voltage regulation.
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 invention.
Specific embodiment
In order that technical scheme is clearer, below in conjunction with accompanying drawing, further is made to frequency converter of the invention
Detailed description.It should be appreciated that specific embodiment described herein is only used to explain that the present invention is not intended to limit the present invention.
Be illustrated in figure 2 the circuit theory diagrams of an embodiment of frequency converter of the invention, the frequency converter include rectification circuit,
Power factor correction circuit and inverter circuit.Wherein, one end of rectification circuit electrically connects with AC power, rectification circuit and power
Factor correction circuit and inverter circuit are sequentially connected electrically, and inverter circuit is electrically connected with load.Preferably, the rectification circuit is rectification
Bridge, rectifier bridge DB1 is made up of four diodes, for AC power to be converted into dc source.
Power factor correction circuit includes the first inductance L2 and the first transistor Z1.First inductance L2 includes the first winding N1
Connected with the second winding N2 with the second winding N2, and the first winding N1.It should be understood that series connection herein refers to the first winding
The Same Name of Ends of N1 is connected 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 colelctor electrode of the first transistor Z1, and the tap coupler of the first inductance L2 is extremely
Inverter circuit, the different name end of the first winding N1 is coupled to rectification circuit.The emitter stage of the first transistor Z1 is coupled to ground.It is preferred that
Ground, the first transistor Z1 is npn type bipolar transistor.
Preferably, inverter circuit is three-phase inverting circuit.Transistor seconds Z2, third transistor Z3 and the 4th transistor Z4
Colelctor electrode be connected to the tap of the first inductance L2, i.e. transistor seconds Z2, third transistor Z3 and the 4th transistor Z4's
Colelctor electrode is connected to the Same Name of Ends of the first winding N1.5th transistor Z5, the hair of the 6th transistor Z6 and the 7th transistor Z7
Emitter-base bandgap grading is coupled to ground.
The emitter stage of transistor seconds Z2 is electrically connected with the colelctor electrode of the 5th transistor Z5, and the base stage of transistor seconds Z2 connects
The upper bridge arm pwm control signal UP of U phases is met, the base stage of the 5th transistor Z5 connects the lower bridge arm pwm control signal UN of U phases.The
The emitter stage of three transistor Z3 is electrically connected with the colelctor electrode of the 6th transistor Z6, and the base stage of third transistor Z3 connects the upper of V phases
The base stage of bridge arm pwm control signal VP, the 6th transistor Z6 connects the lower bridge arm pwm control signal VN of V phases.Similarly, the 4th is brilliant
The emitter stage of body pipe Z4 is electrically connected with the colelctor electrode of the 7th transistor Z7, and the base stage of the 4th transistor Z4 connects the upper bridge arm of W phases
The base stage of pwm control signal WP, the 7th transistor Z7 connects the lower bridge arm pwm control signal WN of W phases.
Preferably, the transistor Z7 of transistor seconds Z2 to the 7th are npn type bipolar transistor.In the present embodiment, bear
It is motor to carry.And the U of motor is connected and is connected to the emitter stage of transistor seconds Z2, the V of motor is connected and is connected to third transistor Z3's
Emitter stage, the W of motor is connected and is connected to the emitter stage of the 4th transistor Z4.
In the inverter circuit before the switch motion of transistor, the first transistor conducting, the direct current of inverter circuit are first controlled
The upper bridge arm P poles of bus reduce the voltage of the upper bridge arm P poles of dc bus from the middle power taking of the first inductance, realize inverse
The high-voltage large current for becoming transistor in circuit switchs the transformation switched to low-voltage, high-current, reduces transistor in inverter circuit
On-state loss and switching loss so that the loss of the frequency converter reduces 30%, realizes the power saving function of frequency converter.
After the conducting of the first transistor Z1, then the switch motion of transistor Z2~Z7 in inverter circuit is controlled, so that will
The as little as relatively low magnitude of voltage of the upper bridge arm P electrode drops of dc bus.In the present embodiment, the upper bridge arm P poles of dc bus
Magnitude of voltage is according to N2/（N1+N2）Value determine, then according still further to motor control require come controlling transistor Z2~Z7 switch
State Transferring.I.e. in the present embodiment, the magnitude of voltage at the two ends of the second winding N2 is the voltage of the upper bridge arm P poles of dc bus
Value, therefore, it can the position of the tap according to the control requirement regulation tap inductor L2 of motor, and then realize the upper of dc bus
The regulation of the magnitude of voltage of bridge arm P poles.
Used as a kind of embodiment, power factor correction circuit also includes the second inductance L1, the first diode D1, second
Diode D2 and electric capacity C1.Wherein, one end of the second inductance L1 connects coupled to the other end of rectification circuit DB1, the second inductance L1
Connect 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
Connect, the negative electrode of the second diode D2 is electrically connected with the different name end of the first winding N1.One end of electric capacity C1 connects the second diode D2
Negative electrode and the first winding N1 different name end, the other end of electric capacity is coupled to ground.
Wherein, the first diode D1 is used to prevent the current reflux on the first inductance L2 to AC power, the second diode
D2 is for preventing the current reflux on electric capacity C1 to AC power.Preferably, electric capacity C1 is electrochemical capacitor.And the positive pole of electric capacity C1
The negative electrode of the second diode D2 and the different name end of the first winding N1 are connected, the negative couplings of electric capacity C1 are extremely.
When the first transistor Z1 is turned on, the first diode D1, first are passed through after the rectified circuit DB1 rectifications of AC power
The loop that transistor Z1 is formed is charged to the second inductance L1, the second inductance L1 storage electric energy.Now by controlling the second inductance L1
And the charging and discharging between electric capacity C1 carries out the exchange of energy to maintain the electromagnetic induction process of inductive load.Due to just
In string alternating current circuit, 90 ° of the voltage delay electric current of capacitor, 90 ° of the voltage leading current of inductance, as long as therefore electric capacity capacitive reactance
Induction reactance collocation with inductance is appropriate, it becomes possible to which the phase for reaching voltage and current in power network is identical, and AC power is unaffected,
Realize the function of Active PFC.
It should be understood that power factor (PF) herein refers to the ratio of the active power with general power in the loop of system, work(
Rate factor can weigh the degree that electric power is used effectively.The value of power factor (PF) is bigger, then the utilization rate of electric power is higher, but highest
No more than 1.Active PFC is exactly the electric current for forbidding inductive load（Inductance current）Power network is back to, electricity is kept all the time
The phase of the voltage and current in net is identical.
When the first transistor Z1 ends, AC power by after rectification circuit DB1 rectifications, by the second inductance L1,
Two diode D2 charge to electric capacity C1, electric capacity C1 storage electric energy.Now, the energy for being stored in the second inductance L1 passes through the two or two pole
Pipe D2 electric capacity C1 is charged, and electric capacity C1 is powered by the first inductance L2 to the upper bridge arm P poles of dc bus, it is possible to achieve dc bus
The function of voltage increase.So when DC voltage is relatively low, it is not necessary to increase extra DC/DC boost inverters, reduce
The cost of transformer, simplifies circuit structure.
When the load of inverter circuit changes, when the number of turn of such as coil of motor changes, specific control can be taken
System strategy, the control strategy can be maintained Dead Time constant or change inverter circuit or change the switch of the first transistor Z1
Mode of frequency etc..Keep power factor correction circuit to export constant voltage by above-mentioned specific control strategy, meet electricity
The requirement of machine control.
Above-mentioned frequency converter, the upper bridge arm of the dc bus of inverter circuit from the middle power taking of the first inductance, in inversion electricity
Before the switch motion of the transistor in road, first control the first transistor conducting, so as to reduce the voltage of dc bus, realize
The high-voltage large current of transistor is switched to be switched to low-voltage, high-current and changed in inverter circuit, so as to reduce the logical of transistor
State is lost and switching loss so that the frequency converter saves electric energy.Meanwhile, the frequency converter realizes the function of Active PFC
The function of being adjusted with DC bus-bar voltage.
Embodiment described above only expresses several embodiments of the invention, and its description is more specific and detailed, but simultaneously
Therefore the limitation to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that for one of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention
Shield scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (7)
1. a kind of frequency converter, including rectification circuit, power factor correction circuit and inverter circuit, the rectification circuit, the work(
Rate factor correction circuit and the inverter circuit are sequentially connected, and one end of the rectification circuit electrically connects with AC power, described
Inverter circuit is electrically connected with load, it is characterised in that：
The power factor correction circuit includes the first inductance L2 and the first transistor Z1；
First inductance is gone here and there including the first winding N1 and the second winding N2, the first winding N1 with the second winding N2
Connection；
The Same Name of Ends of the second winding N2 is electrically connected with the colelctor electrode of the first transistor Z1, the tap coupling of the first inductance L2
Inverter circuit is bonded to, the different name end of the first winding N1 is coupled to the rectification circuit；
, coupled to ground, one end of the rectification circuit is coupled to ground for the emitter stage of the first transistor Z1；
Before the switch motion of the transistor in the inverter circuit, the first transistor is first controlled to turn on, the inversion
The magnitude of voltage of the dc bus of circuit is by N2/（N1+N2）Value determine.
2. frequency converter according to claim 1, it is characterised in that：
The power factor correction circuit also includes the second inductance L1, the first diode D1, the second diode D2 and electric capacity C1；
One end of the second inductance L1 is coupled to the rectification circuit, the other end connection described first of the second inductance L1
The anode of 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, the moon of the second diode D2
Pole electrically connects with the different name end of the first winding N1；
One end of the electric capacity C1 connects the negative electrode of the second diode D2 and the different name end of the first winding N1, the electricity
The other end of appearance is coupled to ground.
3. frequency converter according to claim 2, it is characterised in that：
The electric capacity C1 is electrochemical capacitor；
The positive pole of the electric capacity C1 connects the negative electrode of the second diode D2 and the different name end of the first winding N1, the electricity
Hold the negative couplings of C1 extremely.
4. the frequency converter according to claim any one of 1-3, it is characterised in that：
The inverter circuit include six transistors, respectively transistor seconds Z2, third transistor Z3, the 4th transistor Z4,
5th transistor Z5, the 6th transistor Z6 and the 7th transistor Z7；
The colelctor electrode of the transistor seconds Z2, the third transistor Z3 and the 4th transistor Z4 is connected to described
The tap of one inductance L2；
The emitter stage of the transistor seconds Z2 is electrically connected with the colelctor electrode of the 5th transistor Z5, the third transistor Z3
Emitter stage electrically connected with the colelctor electrode of the 6th transistor Z6, the emitter stage of the 4th transistor Z4 and the described 7th brilliant
The colelctor electrode electrical connection of body pipe Z7；
The 5th transistor Z5, the emitter stage of the 6th transistor Z6 and the 7th transistor Z7 are coupled to ground.
5. frequency converter according to claim 4, it is characterised in that：
The first transistor Z1 to the 7th transistor Z7 is npn type bipolar transistor.
6. frequency converter according to claim 5, it is characterised in that：
The load is motor, and the three-phase of the motor is respectively connecting to the emitter stage of the transistor seconds Z2, the described 3rd
The emitter stage of the emitter stage of transistor Z3 and the 4th transistor Z4.
7. frequency converter according to claim 6, it is characterised in that：
The rectification circuit is rectifier bridge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310728104.XA CN104734531B (en) | 2013-12-24 | 2013-12-24 | Frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310728104.XA CN104734531B (en) | 2013-12-24 | 2013-12-24 | Frequency converter |
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| CN104734531A CN104734531A (en) | 2015-06-24 |
| CN104734531B true CN104734531B (en) | 2017-06-23 |
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| CN201310728104.XA Active CN104734531B (en) | 2013-12-24 | 2013-12-24 | Frequency converter |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU175937U1 (en) * | 2017-06-21 | 2017-12-25 | федеральное государственное бюджетное образовательное учреждение высшего образования "Алтайский государственный технический университет им. И.И. Ползунова" (АлтГТУ) | Transistor frequency converter with compact control system |
| CN107378130A (en) * | 2017-08-24 | 2017-11-24 | 太仓贝斯特机械设备有限公司 | A kind of peeling machine automatically controlled |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2755859Y (en) * | 2004-12-31 | 2006-02-01 | 海尔集团公司 | Power factor compensator of frequency-variable air conditioner |
| CN102255542A (en) * | 2011-07-20 | 2011-11-23 | 南京航空航天大学 | Single-stage boosting inverter with tap inductor |
| CN203674989U (en) * | 2013-12-24 | 2014-06-25 | 珠海格力电器股份有限公司 | Frequency converter |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100732717B1 (en) * | 2005-12-29 | 2007-06-27 | 삼성전자주식회사 | Motor system and control method thereof, and compressor using the same |
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2013
- 2013-12-24 CN CN201310728104.XA patent/CN104734531B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2755859Y (en) * | 2004-12-31 | 2006-02-01 | 海尔集团公司 | Power factor compensator of frequency-variable air conditioner |
| CN102255542A (en) * | 2011-07-20 | 2011-11-23 | 南京航空航天大学 | Single-stage boosting inverter with tap inductor |
| CN203674989U (en) * | 2013-12-24 | 2014-06-25 | 珠海格力电器股份有限公司 | Frequency converter |
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